First off.... congrats on getting a Focusrite. Second... don't worry about the preamps....

Focusrite has a reputation for having stellar preamps in their interfaces.

My suggestion would be to use the condenser mic for vocals and acoustic instruments and use the dynamic for miking electric cabinets.

Just dig in and start working with the Scarlett and don't worry about the preamps... they will handle what you put into them just fine.

I've never had a problem with overloading them..... not once.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.